Q: What about upgrading heads on the Evo’s and TC88s?
All factory heads are designed to meet emission standards. So they are not the best performance heads. Your heads can be ported at Strokers or just replaced with new performance heads. You will get a lot more performance out of either engine with ported or new performance heads with the right combination of parts. Read More →
Q: What is the cure for a tired 80ci Evo?
Answer: The real power is in the heads with the right combination of cam, carb, and exhaust system. We can bore the cases to make a bigger motor out of it, and we can always stroke them, that’s the easy way to get more power. We use quality S&S parts and can build any size engine you want. You can end up with a good dependable 95ci or 98ci motor. To use new and improved power, you will need a high performance ignition system, balanced... [Read More...]
Q: What about boring out an 88ci engine to 95ci?
Answer: Over-boring the 88ci to a 95ci may not leave you enough metal in the cylinders and they could get hot which can cause the cylinder to distort. We recommend replacing the 88ci cylinders with stock 95ci cylinders to start with, in the long run you will be happier with the engine. Read More →
Q: What about changing handlebars?
Answer: For example, if you’re going from stock Dyna bars to ape-hangers. You will need to extent out all of your cables and lines. Some manufacturers will tell you what new bars will require you to change out your control cables. You also need to take into consideration cable length when changing risers. Read More →
Q: What about the importance of tires and tire pressure?
Answer: Check your tire pressure once a week, and stay within the guidelines on the sidewall of the tires. Change tires when they get down to 3/32 of an inch of tread. If you are an average rider, no burnouts and such. You should get about 6,000 miles on a rear tire, and about 8,000 miles on a front tire. Another rule of thumb is two rears to one front. Most people run tires too long. Read More →
Q: Why does my Twin-Cam leak oil out of its air cleaner?
Answer: In a Twin-Cam you may notice blow-by at the breather, which leaves traces of oil down the side of your bike, usually of the heat shields of your exhaust and on the oil bag. The reason for this is, even with the standard petroleum base oil, the scavenger side of the oil pump is marginal for the motor. The oil pump cannot sump the oil out from the bottom end quick enough which causes it to load up in the top end and flow out the breather. Your... [Read More...]
Q: How can my bike be lowered?
Answer: There is more than one way to get your feet flat on the ground. There are shorter shocks for swing arm styles and several lowering kits for softails. Another way is the seat. There are many styles of seats on the market. If you choose a seat with narrower and lower profiles, you can get your feet up to two inches closer to the ground. Gel seats are also available so you don’t have to trade comfort for cool. Then there are tires. Pick a tire... [Read More...]
Q: What about switching my motorcycle oil to synthetic?
Answer: If you are going to switch to synthetic oil you should first establish your break-in miles, somewhere around 2,500 miles. In the engine we recommend 20/60 weight high-grade synthetic oil. Some recommend 20/50 weight for all three lubrication sections of the motorcycle, but we feel it does not have adequate shear strength to protect contacting surfaces in the transmission and primary. When running synthetics you may experience oil seeps in... [Read More...]
Re-Tuning the Heads
“The tighter you squeeze the air mixture, the more horsepower you get out of it,” Doggett said. The box stock Harley-Davidson® engine is built for longevity, not for peak performance, said Tom Doggett of Strokers USA, Inc. Harley de-tunes the Evolution engine by making the head ports less efficient. Doggett said he can increase the engine’s fuel efficiency and boost its horsepower by porting and decking the heads. During the interview, for... [Read More...]
Cylinder Boring for your V-Twin
After your Harley-Davidson® motorcycle has a lot of miles on it and it isn’t running as strong as it should. The cylinders seem to wear closer to the top and they loose mechanical efficiency. You have them bored to get them straight. The engine will then run cooler and have more power. Evolution motors’ cylinders have a tenancy to get out of round because of the long cylinder studs. When the motor gets hot, in lines of traffic in hot... [Read More...]